室温超偏極陽子を用いた新しい不安定核分光法の開発

• Project/Area Number: 16K05380
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Kyushu University
• Principal Investigator: 坂口 聡志 九州大学, 理学研究院, 准教授 (70569566)
• Project Period (FY): 2016-04-01 – 2020-03-31
• Project Status: Granted (Fiscal Year 2018)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: 不安定核 / スピン偏極 / 弾性散乱 / 共鳴散乱 / 偏極標的 / 実験核物理

Outline of Annual Research Achievements

室温超偏極を用いた偏極陽子固体標的の主要サブシステムである、レーザー系・電磁石及びNMR系・マイクロ波系の構築を進めた。九州大学加速器・ビーム応用科学センター内の加速器ビームライン近傍に新規実験スペースを設営し、(a)電磁石の立ち上げ及び磁場分布の一様性の測定を行なった。偏極標的の全領域に渡って十分な磁場強度の一様性が保たれていることを確認した。(b)レーザーの立ち上げ、光学系の構築、パルス化、遮光環境の構築、標的領域への照射試験を行ない、レーザー系の構築を完了した。(c)NMRアンプ及び送受信/検波装置を東京大学CNSから移設した。さらにNMR回路（コイル、チューナー、ネットワークアナライザーもしくはトランスミッター/レシーバー）の構築を行い、制御系の立ち上げを進めている。試料からのNMR信号の確認以外はほぼ完了した。(d)マイクロ波回路の設計を行い、必要要素を調達した。現在、回路の構築を進めている。上記のサブシステム開発の結果、(d)マイクロ波サブシステムの構築及びそれらの統合による偏極試験を残して偏極陽子固体標的の開発が完了した。
また、既に取得している陽子－ヘリウム６弾性散乱の偏極分解能及び微分散乱断面積データの理論解釈のため、核構造及び核反応理論研究者と議論し、核力に基づいた第一原理計算による不安定ヘリウム６核の構造及び反応の精密な記述法の開発を進めた。
上記の成果について、３件の国際会議にて口頭発表を行なった。

Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

本年度までに、国内の複数の研究機関から基幹装置を移設し、一部を本事業により調達し、九州大学において室温超偏極陽子標的を開発する環境を構築した。既に四つの主なサブシステムのうち三つが立ち上がっており、当該装置の原理を応用して、素粒子物理学研究や核磁気共鳴法による生体試料の観察が計画されるなど、近隣分野への波及効果が生まれ始めている。また、初年度に行なった実験（陽子－ヘリウム６弾性散乱測定）の結果の一部が出版された。残り一つのサブシステムを最終年度に整備し、統合試験を行うことで、標的を完成させられると考えている。計画全体として、概ね順調に進展している。

Strategy for Future Research Activity

最終年度においては、これまでに構築したサブシステム（レーザー系、電磁石及びNMR系、マイクロ波系、磁場掃引系）を組み合わせ、九州大学における室温超偏極陽子固体標的を完成させ、偏極実験を行う。偏極実験においては、従来の偏極標的の用いている磁場より４倍高い0.4 Tという高磁場における室温超偏極に挑戦する。さらに、理化学研究所で行なった陽子－炭素９共鳴散乱測定の理論解析を進め、R行列解析に基づいて陽子過剰非束縛核である窒素１０の基底状態及び低励起状態のエネルギーやスピン・パリティに関する情報を抽出し、結果を投稿論文として発表することを計画している。

Research Products

• [Int'l Joint Research] 慶北大学(大韓民国)
• [Int'l Joint Research] IPN Orsay(フランス)
• [Int'l Joint Research] Oak Ridge National Laboratory(アメリカ合衆国)
• [Int'l Joint Research] University of Hong Kong/Beihang University(中華人民共和国)
• [Journal Article] Proton elastic scattering at 200 A MeV and high momentum transfers of 1.7?2.7 fm?1 as a probe of the nuclear matter density of 6He (2018)
  • Author(s): S. Chebotaryov, S. Sakaguchi (62人中2番目), et al.
  • Journal Title: Progress of Theoretical and Experimental Physics Volume: 5 Pages: 1-20
  • DOI: 10.1093/ptep/pty048
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Extraction of the Landau-Migdal Parameter from the Gamow-Teller Giant Resonance in Sn132 (2018)
  • Author(s): J. Yasuda, M. Sasano, S. Sakaguchi (60人中39番目), et al.
  • Journal Title: Physical Review Letters Volume: 121 Pages: 132501-132501
  • DOI: 10.1103/physrevlett.121.132501
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Proton elastic scattering at 200 A MeV and high momentum transfers of 1.7-2.7 fm-1 as probe of nuclear matter density of 6He (2018)
  • Author(s): S. Chebotaryov, S. Sakaguchi (62人中2番目), et al.
  • Journal Title: Prog. Theor. Exp. Phys. Volume: 印刷中
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Excitation of the Isovector Spin Monopole Resonance via the Exothermic 90Zr(12N, 12C) Reaction at 175 MeV/u (2018)
  • Author(s): S. Noji, S. Sakaguchi (30人中22番目), et al.
  • Journal Title: Phys. Rev. Lett. Volume: 印刷中
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Systematic analysis of inelastic $\ensuremath{\alpha}$ scattering off self-conjugate $A=4n$ nuclei (2018)
  • Author(s): S. Adachi, S. Sakaguchi (39人中28番目), et al.
  • Journal Title: Physical Review C Volume: 97 Pages: 014601-014601
  • DOI: 10.1103/physrevc.97.014601
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Exclusive quasi-free proton knockout from oxygen isotopes at intermediate energies (2018)
  • Author(s): Kawase Shoichiro 他
  • Journal Title: Prog. Theor. Exp. Phys. Volume: 2018 Pages: 014601-014601
  • DOI: 10.1093/ptep/pty011
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Neutron production cross sections for (don) reactions at 55 MeV (2017)
  • Author(s): T. Wakasa, S. Sakaguchi (7人中7番目), et al.
  • Journal Title: Prog. Theor. Exp. Phys. Volume: 8
  • DOI: 10.1093/ptep/ptx099
  • Peer Reviewed
• [Journal Article] Cross sections and analyzing powers for (p(pol), np) reactions of 2H, 6Li, and 12C at 296 MeV (2017)
  • Author(s): T. Wakasa, S. Sakaguchi (20人中16番目), et al.
  • Journal Title: Physica Review C Volume: 96 Pages: 014604-014604
  • DOI: 10.1103/physrevc.96.014604
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Complete set of deuteron analyzing powers from d(pol)p elastic scattering at 190 MeV/nucleon (2017)
  • Author(s): K. Sekiguchi, S. Sakaguchi (31人中19番目), et al.
  • Journal Title: Physical Review C Volume: 96 Pages: 064001-064001
  • DOI: 10.1103/physrevc.96.064001
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Studies of Unstable Nuclei with Spin-Polarized Proton Target (2016)
  • Author(s): Satoshi Sakaguchi, Tomohiro Uesaka, Takashi Wakui, Sergey Chebotaryov, Tomomi Kawahara, Shoichiro Kawase, Evgeniy Milman, Tsz Leung Tang, Kenichiro Tateishi and Takashi Teranishi
  • Journal Title: Proceedings of 21st International Symposium on Spin Physics (SPIN 2014), International Journal of Modern Physics: Conference Series Volume: 40
  • DOI: 10.1142/s2010194516600715
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Study of Three-Nucleon Force Effect via Few-Nucleon Scattering (2016)
  • Author(s): Y. Wada, K. Sekiguchi, U. Gebauer, J. Miyazaki, T. Taguchi, M. Dozono, H. Sakai, N. Sakamoto, M. Sasano, Y. Shimizu, H. Suzuki, T. Uesaka, S. Kawase, Y. Kubota, C. S. Lee, T. L. Tang, K. Yako, Y. Maeda, K. Miki, H. Okamura, S. Sakaguchi, T. Wakasa
  • Journal Title: International Journal of Modern Physics Conf. Ser. Volume: 40 Pages: 1660070-1660070
  • DOI: 10.1142/s2010194516600703
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Development of Neutron Polarization Measurement System for Studying NN interaction in Nuclear Medium (2016)
  • Author(s): J. Yasuda, T. Wakasa, M. Dozono, T. Fukunaga, S. Gotanda, K. Hatanaka, Y. Kanaya. Y. Maeda, Y. Maeda, K. Miki, Y. Nishio, T. Noro, K. Ohnaka, S. Sakaguchi, Y. Sakemi, K. Sekiguchi, A. Tamii, T. Taguchi and Y. Wada
  • Journal Title: Proceedings of 21st International Symposium on Spin Physics (SPIN 2014), International Journal of Modern Physics: Conference Series Volume: 40
  • DOI: 10.1142/s2010194516600739
  • Peer Reviewed / Open Access
• [Journal Article] The Spin Studies in Few-Body Systems at Nuclotron (2016)
  • Author(s): V. P. Ladygin, I. Dobrin, V. V. Fimushkin, S. Sakaguchi et al.
  • Journal Title: Proceedings of 21st International Symposium on Spin Physics (SPIN 2014), International Journal of Modern Physics: Conference Series Volume: 40
  • DOI: 10.1142/s2010194516600740
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Inverse kinematics (p,n) reactions studies using the WINDS slow neutron detector and the SAMURAI spectrometer (2016)
  • Author(s): J. Yasuda et al.,
  • Journal Title: Nucl. Instrum. Methods Phys. Res. B Volume: 未定 Pages: 393-393
  • DOI: 10.1016/j.nimb.2016.02.007
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Dependence of spin-polarized proton target performance on microwave resonator thickness parameter and operation temperature (2016)
  • Author(s): S. Chebotaryov, S. Sakaguchi et al.
  • Journal Title: RIKEN Accel. Prog. Rep. Volume: 49 Pages: 174-174
  • Open Access / Int'l Joint Research
• [Journal Article] Production of low-energy 4.17 MeV/nucleon 9C beam with polyethylene degrader at RIPS (2016)
  • Author(s): E. Milman, T. Teranishi, S. Sakaguchi et al.
  • Journal Title: RIKEN Accel. Prog. Rep. Volume: 49 Pages: 160-160
  • Open Access / Int'l Joint Research
• [Journal Article] Development of the He-filling system for the SAMURAI spectrometer (2016)
  • Author(s): V. Panin, S. Chebotaryov, S. Sakaguchi et al.
  • Journal Title: RIKEN Accel. Prog. Rep. Volume: 49 Pages: 168-168
  • Open Access / Int'l Joint Research
• [Presentation] Elastic scattering of 6He from polarized proton at 200 A MeV (2018)
  • Author(s): S. Sakaguchi
  • Organizer: 10th International Conference on Direct Reactions with Exotic Beams (DREB2018)
  • Int'l Joint Research
• [Presentation] Proton elastic scattering from 6He at 200 A MeV measured with polarized proton target for RI-beam experiments (2018)
  • Author(s): S. Sakaguchi
  • Organizer: The IX International Symposium on EXOtic Nuclei (EXON-2018)
  • Int'l Joint Research
• [Presentation] Elastic scattering of polarized protons from 6He at 200 A MeV (2018)
  • Author(s): S. Sakaguchi
  • Organizer: 13th International Conference on Nucleus-Nucleus Collisions (NN2018)
  • Int'l Joint Research
• [Presentation] Elastic scattering of polarized proton from 6He (2017)
  • Author(s): S. Sakaguchi
  • Organizer: SAMURAI International Collaboration Workshop 2017
  • Int'l Joint Research
• [Presentation] Status of data analysis from experiment on p-6He elastic scattering at 200 MeV/nucleon (2017)
  • Author(s): S. Chebotaryov, S. Sakaguchi for SAMURAI13 Collaboration
  • Organizer: 日本物理学会 第72回年次大会
  • Place of Presentation: Osaka University
• [Presentation] Polarized proton target at SAMURAI: Elastic scattering of 6He from polarized proton (2016)
  • Author(s): S. Sakaguchi for SAMURAI13 Collaboration
  • Organizer: SAMURAI International Collaboration Workshop 2016
  • Place of Presentation: Kyushu University
  • Int'l Joint Research
• [Presentation] Experiment on elastic scattering of polarized protons from neutron-rich 6He isotopes at 200 MeV/nucleon (2016)
  • Author(s): S. Chebotaryov, S. Sakaguchi for SAMURAI13 Collaboration
  • Organizer: 日本物理学会 2016年秋季大会
  • Place of Presentation: Miyazaki University
• [Presentation] Search for low-lying resonances in 10N structure via 9C + p resonant scattering (2016)
  • Author(s): E. Milman, T. Teranishi, S. Sakaguchi for RRC27 Collaboration
  • Organizer: 日本物理学会 2016年秋季大会
  • Place of Presentation: Miyazaki University
• [Presentation] Elastic scattering of neutron-rich 6He nuclei from polarized protons at 200 A MeV (2016)
  • Author(s): S. Chebotaryov, S. Sakaguchi for SAMURAI13 Collaboration
  • Organizer: 22nd International Spin Symposium
  • Place of Presentation: University of Illinois (USA)
  • Int'l Joint Research
• [Funded Workshop] SAMURAI International Collaboration Workshop 2016 (2016)
  • Place of Presentation: 九州大学 伊都キャンパス（福岡県福岡市）
  • Year and Date: 2016-09-05